/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

package org.apache.kylin.invertedindex.index;

import java.util.List;

import com.google.common.collect.Lists;

public class ShardingSliceBuilder {

    IncrementalSliceMaker[] builders;

    public ShardingSliceBuilder(TableRecordInfo info) {
        int sharding = info.getDescriptor().getSharding();
        builders = new IncrementalSliceMaker[sharding];
        for (short i = 0; i < sharding; i++) {
            builders[i] = new IncrementalSliceMaker(info, i);
        }
    }

    // NOTE: record must be appended in time order
    public Slice append(TableRecord rec) {
        short shard = rec.getShard();
        return builders[shard].append(rec);
    }

    public List<Slice> close() {
        List<Slice> result = Lists.newArrayList();
        for (IncrementalSliceMaker builder : builders) {
            Slice slice = builder.close();
            if (slice != null)
                result.add(slice);
        }
        return result;
    }

}
